I'm sure it works in wine but I was looking for something that I could tweak for my own reasons, one of them being an xrumer proxy harvesting tool.
I do this, just shoot a $_POST to some site of yours and save the proxies. Then just change the botmaster proxy url in xrum to your output page.
I get what you're saying with the source & stuff (big open source nut here), but some products just aren't going to go this route. If they're inexpensive enough (how much of your time is $25 worth?) then just accept it and move on with your life. The only real value open sourcing this would have is to repackage it with other programs, you can see why mattseh would be reluctant to have that happen.